<div class="sub_nav">
      <div class="top clearfix">
         <div class="go_back f_l" (click)="goBack()"><</div>
        <img src="/assets/img/logo.png" alt="" class="logo" width="40" height="48" style="margin-right: 7px;margin-bottom: 5px">
        <span class="big_title" style="color: white;">{{className}}（{{peoples}}人）</span>
      </div>
      <div class="menu">
        <nz-tabset [nzSelectedIndex]="routerIndex">
          <nz-tab nzTitle="我的成绩" (nzClick)="routerMap(0)">
          </nz-tab>
          <nz-tab nzTitle="班级成员" (nzClick)="routerMap(1)">
          </nz-tab>
          <nz-tab nzTitle="班级公告" (nzClick)="routerMap(2)">
          </nz-tab>
        </nz-tabset>
        <div class="no_read_logo" *ngIf="haveUnRead"></div>
      </div>
</div>

